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# e - (b acceptor concentration,N a =5x10 20 m-3 and(c N d...

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1. A solid cylindrical piece of silicon has radius 2mm and length 1cm. Calculate the resistance along the length of the silicon assuming:- (a) a donor concentration of 5x10 22 m -3 (b) an acceptor concentration of 5x10 22 m -3 (c) the silicon is intrinsic. [Assume n i =1.2x10 16 m -3 , μ e =0.14m 2 V -1 s -1 , μ h =0.048m 2 V -1 s -1 , e=1.6x10 -19 C]. 2. Calculate the equilibrium concentrations of electrons and holes in silicon at 290K with (a) donor concentration N d =1.5x10 22 m -3 ,
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Unformatted text preview: (b) acceptor concentration,N a =5x10 20 m-3 and (c) N d =7.5x10 16 m-3 and N a =5x10 16 m-3 . [Assume n i =1.2x10 16 m-3 ]. 3. Calculate the acceptor dopant density which is needed to fabricate a resistor of value 870 Ω in an integrated circuit. The resistors length and breadth are 50 μ m and 5 μ m respectively and the depth of diffusion can be assumed to be 2.5 μ m. [Hole mobility μ p =0.048m 2 V-1 s-1 ]....
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